Name: Alcaligenes paradoxus Davis 1969 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: pa.ra.do’xus. N.L. masc. adj. paradoxus, strange, contrary to all expectation, in reference to the chemolithotrophic and/or organotrophic metabolism of the organism

Gender: masculine

Type strain: ATCC 17713; CCUG 1777; CIP 103459; DSM 30034; IFO 15149; JCM 20526; JCM 20895; LMG 1797; NBRC 15149; VKM B-1329

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB622219 Analyse FASTA

Effective publication: Davis DH, Doudoroff M, Stanier RY, Mandel M. Proposal to reject the genus Hydrogenomonas: taxonomic implications. International Journal of Systematic Bacteriology 1969; 19:375-390.

IJSEM list: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym

Correct name: Variovorax paradoxus (Davis 1969) Willems et al. 1991

Risk group: 2

• Synonyms:

  • Name	Kind
    Variovorax paradoxus (Davis 1969) Willems et al. 1991	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Alcaligenes paradoxus is the correct name instead if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Alcaligenes.
  • ✏ The authority of the taxon name (Davis) deliberately differs from the authors of the publication (Davis et al.).
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 2, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 1. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 1.
  • 🎓 Name mentioned 9 times in PubMed until 2024-03-28.

Parent taxon: Alcaligenes Castellani and Chalmers 1919 (Approved Lists 1980)

Assigned by: Davis DH, Doudoroff M, Stanier RY, Mandel M. Proposal to reject the genus Hydrogenomonas: taxonomic implications. International Journal of Systematic Bacteriology 1969; 19:375-390.

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Record number: 773019